Ed ward halsby



U ITED STATES PATENT OFFICE.

EDWARD HALSEY, OF SAN JOSE, CALIFORNIA, ASSIGNOR OF ONE-HALF TO HARRY BARLING, OF SAME PLACE.

TURN-TABLE.

SPECIFICATION formingpart of Letters Patent No. 248,311, dated October 18, 1881.

Application filed June 10, 1881.

To all whom it may concern Be it known that I, EDWARD HALSEY, of the city of San Jose, county of Santa Clara, State of California, have invented certain new and useful Improvements in Turn-Tables for Railroads and Draw-Bridges, and for other purposes, of which thefollowing is aspecilication.

The nature and object of my invention is thenovel construction of a turn-table, in which the friction is reduced to its minimum, as will be more fully shown by reference to the accompanying drawings, in which- Figure 1 shows the top plate inverted, with the friction-rollers and carriage in the proper position. Fig.2 is an elevation of the turntable. Fig. 3 is a sectional view of the same.

A is the bottom plate or circular track on which the face of the friction-roller a runs. The friction-roller is slightly convexed on its face to allow the axles to properly operate upon the circular tracks of the top plate.

B is the top plate, which is grooved, as shown at b, sufficiently to allow the rollers a to revolve therein without coming in contact with the sides of the groove thus formed. This groove forms on the top plate a circular track on each side of the friction-roller, as shown at c and d. The circular tracks rest upon and are supported on the axles of the frictionrollers a. The axles e of the friction-rollers are of such conical shape, the larger end of (No model.)

the cone revolving on the outer track, 0, of the top plate, and the smaller end revolving on the inner track, d, that each end travels on 5 its corresponding plane or track in a perfect circle without abrasion.

The friction-rollers a are kept in proper position by two circles,fand g, in which they are pivoted, as shown at h, at proper distance 0 45 j is the center pin or bolt on which the table turns, and 7c is the corresponding socket therefor. Any movement of the table causes the friction-rollers a to revolve on the bottom plate or track, and at the same time the axles e re- 50 volve in the same direction upon the tracks 0 and d of the top plate, thus dispensing with all journal friction.

I claim as my invention The combination of the track A, friction- 5 rollers-a, the groove 1), the circular tracks a and d, the conical axles e, and the carriage f g, substantially as and for the purposes hereinbefore set forth.

EDWARD HALSEY.

Witnesses:

F. J. SAXE, FRANZ M. GOLDSTEIN. 

